various edge case fixes

android/app/src/main/kotlin/deckers/thibault/aves/channel/calls/DebugHandler.kt

@@ -33,7 +33,10 @@ import io.flutter.plugin.common.MethodCall
 import io.flutter.plugin.common.MethodChannel
 import io.flutter.plugin.common.MethodChannel.MethodCallHandler
 import io.flutter.util.PathUtils
-import kotlinx.coroutines.*
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.SupervisorJob
+import kotlinx.coroutines.launch
 import org.beyka.tiffbitmapfactory.TiffBitmapFactory
 import java.io.IOException
 
@@ -84,7 +87,7 @@ class DebugHandler(private val context: Context) : MethodCallHandler {
             }
         }.mapValues { it.value?.path }.toMutableMap()
         dirs["externalCacheDirs"] = context.externalCacheDirs.joinToString { it.path }
-        dirs["externalFilesDirs"] = context.getExternalFilesDirs(null).joinToString { it.path }
+        dirs["externalFilesDirs"] = context.getExternalFilesDirs(null).joinToString { it?.path ?: "null" }
 
         // used by flutter plugin `path_provider`
         dirs.putAll(

android/app/src/main/kotlin/deckers/thibault/aves/channel/streams/StorageAccessStreamHandler.kt

@@ -13,6 +13,7 @@ import deckers.thibault.aves.PendingStorageAccessResultHandler
 import deckers.thibault.aves.utils.LogUtils
 import deckers.thibault.aves.utils.MimeTypes
 import deckers.thibault.aves.utils.PermissionManager
+import deckers.thibault.aves.utils.StorageUtils
 import io.flutter.plugin.common.EventChannel
 import io.flutter.plugin.common.EventChannel.EventSink
 import kotlinx.coroutines.CoroutineScope
@@ -80,6 +81,11 @@ class StorageAccessStreamHandler(private val activity: Activity, arguments: Any?
             return
         }
 
+        if (uris.any { !StorageUtils.isMediaStoreContentUri(it) }) {
+            error("requestMediaFileAccess-nonmediastore", "request is only valid for Media Store content URIs, uris=$uris", null)
+            return
+        }
+
         if (Build.VERSION.SDK_INT < Build.VERSION_CODES.R) {
             error("requestMediaFileAccess-unsupported", "media file bulk access is not allowed before Android R", null)
             return
@@ -148,12 +154,17 @@ class StorageAccessStreamHandler(private val activity: Activity, arguments: Any?
 
         fun onGranted(uri: Uri) {
             ioScope.launch {
+                try {
                     activity.contentResolver.openInputStream(uri)?.use { input ->
                         val buffer = ByteArray(BUFFER_SIZE)
                         var len: Int
                         while (input.read(buffer).also { len = it } != -1) {
                             success(buffer.copyOf(len))
                         }
+                    }
+                } catch (e: Exception) {
+                    Log.e(LOG_TAG, "failed to open input stream for uri=$uri", e)
+                } finally {
                     endOfStream()
                 }
             }

android/app/src/main/kotlin/deckers/thibault/aves/utils/StorageUtils.kt

@@ -36,13 +36,14 @@ object StorageUtils {
     const val TRASH_PATH_PLACEHOLDER = "#trash"
 
     private fun isAppFile(context: Context, path: String): Boolean {
-        return context.getExternalFilesDirs(null).any { filesDir -> path.startsWith(filesDir.path) }
+        val filesDirs = context.getExternalFilesDirs(null).filterNotNull()
+        return filesDirs.any { path.startsWith(it.path) }
     }
 
     private fun appExternalFilesDirFor(context: Context, path: String): File? {
-        val filesDirs = context.getExternalFilesDirs(null)
+        val filesDirs = context.getExternalFilesDirs(null).filterNotNull()
         val volumePath = getVolumePath(context, path)
-        return volumePath?.let { filesDirs.firstOrNull { it.startsWith(volumePath) } } ?: filesDirs.first()
+        return volumePath?.let { filesDirs.firstOrNull { it.startsWith(volumePath) } } ?: filesDirs.firstOrNull()
     }
 
     fun trashDirFor(context: Context, path: String): File? {

lib/widgets/dialogs/add_shortcut_dialog.dart

@@ -154,5 +154,9 @@ class _AddShortcutDialogState extends State<AddShortcutDialog> {
     _isValidNotifier.value = name.isNotEmpty;
   }
 
-  void _submit(BuildContext context) => Navigator.pop(context, Tuple2<AvesEntry?, String>(_coverEntry, _nameController.text));
+  void _submit(BuildContext context) {
+    if (_isValidNotifier.value) {
+      Navigator.pop(context, Tuple2<AvesEntry?, String>(_coverEntry, _nameController.text));
+    }
+  }
 }

lib/widgets/dialogs/entry_editors/rename_dialog.dart

@@ -87,5 +87,9 @@ class _RenameEntryDialogState extends State<RenameEntryDialog> {
     _isValidNotifier.value = newName.isNotEmpty && !exists;
   }
 
-  void _submit(BuildContext context) => Navigator.pop(context, _nameController.text);
+  void _submit(BuildContext context) {
+    if (_isValidNotifier.value) {
+      Navigator.pop(context, _nameController.text);
+    }
+  }
 }

lib/widgets/dialogs/filter_editors/create_album_dialog.dart

@@ -157,5 +157,9 @@ class _CreateAlbumDialogState extends State<CreateAlbumDialog> {
     _isValidNotifier.value = newName.isNotEmpty && !exists;
   }
 
-  void _submit(BuildContext context) => Navigator.pop(context, _buildAlbumPath(_nameController.text));
+  void _submit(BuildContext context) {
+    if (_isValidNotifier.value) {
+      Navigator.pop(context, _buildAlbumPath(_nameController.text));
+    }
+  }
 }

lib/widgets/dialogs/filter_editors/rename_album_dialog.dart

@@ -84,8 +84,12 @@ class _RenameAlbumDialogState extends State<RenameAlbumDialog> {
     final path = _buildAlbumPath(newName);
     final exists = newName.isNotEmpty && await FileSystemEntity.type(path) != FileSystemEntityType.notFound;
     _existsNotifier.value = exists && newName != initialValue;
-    _isValidNotifier.value = newName.isNotEmpty && !exists;
+    _isValidNotifier.value = newName.isNotEmpty;
   }
 
-  void _submit(BuildContext context) => Navigator.pop(context, _nameController.text);
+  void _submit(BuildContext context) {
+    if (_isValidNotifier.value) {
+      Navigator.pop(context, _nameController.text);
+    }
+  }
 }

lib/widgets/viewer/overlay/thumbnail_preview.dart

@@ -62,5 +62,9 @@ class _ViewerThumbnailPreviewState extends State<ViewerThumbnailPreview> {
     );
   }
 
-  void _onScrollerIndexChange() => _debouncer(() => ViewEntryNotification(index: _entryIndexNotifier.value).dispatch(context));
+  void _onScrollerIndexChange() => _debouncer(() {
+        if (mounted) {
+          ViewEntryNotification(index: _entryIndexNotifier.value).dispatch(context);
+        }
+      });
 }